This study proposes to test for the existence of an adaptation effect of rural-to-urban migration. The design is to divide migrants into two groups at the time of observation: one group which had migrated by that time, and another group consisting of individuals who had not yet migrated but are known to migrate later. It is presumed that if the former group had not migrated it would have had a birth path similar to the latter group. Adaptation is measured by the difference between this hypothetical birth path and the actual birth path of migrants observed after they migrate. The model is tested on Korean women and found to support the existence of an adaptation effect.

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